68680687 has 4 divisors (see below), whose sum is σ = 72295480. Its totient is φ = 65065896.

The previous prime is 68680681. The next prime is 68680721. The reversal of 68680687 is 78608686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68680687 - 2¹⁹ = 68156399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68680687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68680681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807368 + ... + 1807405.

It is an arithmetic number, because the mean of its divisors is an integer number (18073870).

Almost surely, 2^68680687 is an apocalyptic number.

68680687 is a deficient number, since it is larger than the sum of its proper divisors (3614793).

68680687 is a wasteful number, since it uses less digits than its factorization.

68680687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614792.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 68680687 is about 8287.3811907019. The cubic root of 68680687 is about 409.5229172135.

The spelling of 68680687 in words is "sixty-eight million, six hundred eighty thousand, six hundred eighty-seven".